History of Math.acos() Revision history for: English (US) Jul 28, 2016, 8:49:52 AM eduardoboucas Adjust wording of Return value Previous Jul 28, 2016, 8:49:13 AM eduardoboucas Add "Return value" section as per Bug 1287421 Previous Dec 28, 2015, 3:41:44 PM fscholz Previous Jul 7, 2015, 6:18:02 AM fscholz fix compat parsing error; cleanup Previous Feb 4, 2015, 9:17:16 PM Mingun Standardized markup, added {{jsxref}} macro, added `Reference` tag. Previous Jan 22, 2015, 12:27:01 AM schlagi123 Previous Mar 7, 2014, 1:36:42 PM fred.wang Previous Dec 4, 2013, 8:09:54 AM fscholz Previous Dec 4, 2013, 8:04:52 AM fscholz Previous Dec 4, 2013, 7:58:23 AM fscholz